Bug 36004: Fixed typo in successfully

Bug 36004: Fixed typo in successfully

To test:

1. Turn on the syspref 'OpacCatalogConcerns'

2. Go to view a record in the OPAC and click on "Report a concern" in
   the column located on the right-hand side.

3. Fill out the title on the form and leave everything else the same.
   Click on submit and notice that the message on the screen says "Your
   concern was sucessfully submitted."

4. Apply the patch.

5. Submit a new concern. Notice that the text now has "successfully"
   spelled correctly.

6. Sign off and have a great day! :D

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>